Thanks for the report loom.
This is definitely a weird situation because if your associates play on WGT already then their email wouldn't have been necessary for the gifting, just their screen name. I have gifted hundreds of items myself and never have seen the issue you just described.
Since the link came from your friend's email address (and not from a WGT email) I'd recommend having him once-over his computer for any Viruses/Trojans that might be resident in his email client. Generally when something like this happens that's the first culprit.
Keep your eyes open though and if you do notice strange links coming from WGT-related email addresses then please send us an email at members@worldgolftour.com